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/**
* Copyright (C) 2018-present MongoDB, Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the Server Side Public License, version 1,
* as published by MongoDB, Inc.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* Server Side Public License for more details.
*
* You should have received a copy of the Server Side Public License
* along with this program. If not, see
* <http://www.mongodb.com/licensing/server-side-public-license>.
*
* As a special exception, the copyright holders give permission to link the
* code of portions of this program with the OpenSSL library under certain
* conditions as described in each individual source file and distribute
* linked combinations including the program with the OpenSSL library. You
* must comply with the Server Side Public License in all respects for
* all of the code used other than as permitted herein. If you modify file(s)
* with this exception, you may extend this exception to your version of the
* file(s), but you are not obligated to do so. If you do not wish to do so,
* delete this exception statement from your version. If you delete this
* exception statement from all source files in the program, then also delete
* it in the license file.
*/
#include "mongo/platform/basic.h"
#include "mongo/util/errno_util.h"
#include <sstream>
#ifndef _WIN32
#include <cstring> // For strerror_r
#include <errno.h> // For errno
#endif
#include "mongo/util/scopeguard.h"
#include "mongo/util/text.h"
namespace mongo {
namespace {
const char kUnknownMsg[] = "Unknown error";
const int kBuflen = 256; // strerror strings in non-English locales can be large.
} // namespace
std::string errnoWithDescription(int errNumber) {
#if defined(_WIN32)
if (errNumber == -1)
errNumber = GetLastError();
#else
if (errNumber < 0)
errNumber = errno;
#endif
char buf[kBuflen];
char* msg{nullptr};
#if defined(__GNUC__) && defined(_GNU_SOURCE) && !(__ANDROID_API__ <= 22) && !defined(EMSCRIPTEN)
msg = strerror_r(errNumber, buf, kBuflen);
#elif defined(_WIN32)
LPWSTR errorText = nullptr;
FormatMessageW(FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_ALLOCATE_BUFFER |
FORMAT_MESSAGE_IGNORE_INSERTS,
nullptr,
errNumber,
0,
reinterpret_cast<LPWSTR>(&errorText), // output
0, // minimum size for output buffer
nullptr);
if (errorText) {
ON_BLOCK_EXIT([&errorText] { LocalFree(errorText); });
std::string utf8ErrorText = toUtf8String(errorText);
auto size = utf8ErrorText.find_first_of("\r\n");
if (size == std::string::npos) { // not found
size = utf8ErrorText.length();
}
if (size >= kBuflen) {
size = kBuflen - 1;
}
memcpy(buf, utf8ErrorText.c_str(), size);
buf[size] = '\0';
msg = buf;
} else if (strerror_s(buf, kBuflen, errNumber) != 0) {
msg = buf;
}
#else /* XSI strerror_r */
if (strerror_r(errNumber, buf, kBuflen) == 0) {
msg = buf;
}
#endif
if (!msg) {
return {kUnknownMsg};
}
return {msg};
}
std::pair<int, std::string> errnoAndDescription() {
#if defined(_WIN32)
int errNumber = GetLastError();
#else
int errNumber = errno;
#endif
return {errNumber, errnoWithDescription(errNumber)};
}
std::string errnoWithPrefix(StringData prefix) {
const auto suffix = errnoWithDescription();
std::stringstream ss;
if (!prefix.empty())
ss << prefix << ": ";
ss << suffix;
return ss.str();
}
} // namespace mongo
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